LOCATION KEATCHIE LA+TX
Tentative Series
REL: DS: EPM
01/2023
KEATCHIE SERIES
The Keatchie series consists of very deep, well drained, moderately permeable soils that formed in loamy Coastal Plain sediments. The soils are on nearly level to moderately sloping uplands. Slopes are dominantly less than 5 percent but range from 1 to 8 percent. Mean annual air temperature is about 19 degrees C (66 degrees F), and mean annual precipitation is about 1118 mm (44 in).
TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, thermic Glossic Paleudalfs
TYPICAL PEDON: Keatchie fine sandy loam, 3 percent slope--in pine plantation. (Colors are for moist soil unless otherwise stated.)
A--0 to 5 cm (0 to 2 in); brown (10YR 4/3) fine sandy loam; weak medium granular structure; very friable, soft, nonsticky, nonplastic; common fine roots throughout and common medium roots throughout and common coarse roots throughout and common very fine roots throughout; common fine low-continuity interstitial pores; slightly acid; clear smooth boundary. (5 to 22 cm [2 to 9 in] thick)
E--5 to 67 cm (2 to 26 in); light yellowish brown (10YR 6/4) fine sandy loam; weak medium subangular blocky parts to weak fine subangular blocky structure; very friable, soft, nonsticky, nonplastic; common fine roots throughout and common very fine roots throughout; common fine low-continuity interstitial pores; slightly acid; gradual smooth boundary. (0 to 35 cm [0 to 14 in] thick)Bt1--40 to 67 cm (16 to 26 in); yellowish brown (10YR 5/6) clay loam; weak medium prismatic parts to moderate medium subangular blocky structure; friable, hard, slightly sticky, slightly plastic; common fine roots throughout and common coarse roots throughout and many very fine roots throughout; common fine low-continuity tubular pores; 10 percent continuous distinct 10YR6), moist, clay films on all faces of peds; moderately acid; gradual wavy boundary. (24 to 44 cm [9 to 17 in] thick)
Bt2--67 to 122 cm (26 to 48 in); yellowish brown (10YR 5/6) sandy clay loam; moderate medium prismatic parts to moderate medium subangular blocky structure; firm, hard, slightly sticky, slightly plastic; common coarse roots between peds and very few very fine roots between peds; common fine low-continuity tubular pores; 1 percent continuous distinct 10YR3), moist, skeletans on vertical faces of peds and 25 percent continuous distinct 7.5YR6), moist, clay films on all faces of peds; 2 percent coarse prominent irregular very weakly cemented 2.5YR 4/6, moist, plinthite nodules with sharp boundaries in matrix and 20 percent coarse prominent irregular 2.5YR 4/6, moist, masses of oxidized iron with sharp boundaries in matrix; moderately acid; gradual wavy boundary. (21 to 55 cm [8 to 22 in] thick)
Bt/E--122 to 152 cm (48 to 60 in); 93 percent yellowish brown (10YR 5/6) and 7 percent light yellowish brown (2.5Y 6/4) sandy clay loam; moderate medium prismatic parts to moderate medium subangular blocky structure; firm, hard, slightly sticky, slightly plastic; very few fine roots between peds; common medium low-continuity tubular pores; 25 percent continuous distinct 7.5YR6), moist, clay films on all faces of peds; 3 percent coarse prominent irregular very weakly cemented 2.5YR 4/6, moist, plinthite nodules with sharp boundaries in matrix and 20 percent coarse prominent irregular 2.5YR 4/6, moist, masses of oxidized iron with clear boundaries in matrix; 7 percent albic tongues (volume percent); moderately acid; gradual wavy boundary. (26 to 87 cm [10 to 34 in] thick)
Bt/Eg--152 to 203 cm (60 to 80 in); 80 percent yellowish brown (10YR 5/6) and 20 percent light brownish gray (10YR 6/2) sandy clay loam; moderate medium prismatic parts to moderate medium subangular blocky structure; firm, hard, slightly sticky, slightly plastic; very few fine roots between peds and very few coarse roots between peds; many medium moderate-continuity tubular and common coarse moderate-continuity tubular pores; 20 percent continuous distinct 7.5YR6), moist, clay films on all faces of peds; 3 percent coarse prominent irregular very weakly cemented 2.5YR 4/6, moist, plinthite nodules with sharp boundaries in matrix and 12 percent coarse prominent irregular 2.5YR 4/6, moist, masses of oxidized iron with sharp boundaries in matrix; 20 percent albic tongues (volume percent); moderately acid.
TYPE LOCATION: De Soto Parish Louisiana; about 5 miles east of Mansfield on U.S. 84, 1.7 miles south on State Road 522 on the west side of the road, 100 feet southwest in pine plantation. Mansfield USGS quad; Lattitude, 32 degrees, 1 minutes, 23.62 seconds N; Logitude, 93 degrees, 38 minutes, 13.24 seconds W, NAD 83.
RANGE IN CHARACTERISTICS:
Soil Moisture: An udic soil moisture regime. The soil moisture control section is not dry in any part for more than 90 days in normal years.
Mean annual soil temperature: 19 to 21 degrees C (67 to 70 degrees F)
Depth to argillic horizon: 22 to 42cm (9 to 17 in)
Thickness of solum: more than 203 cm (more than 80 in)
Particle-size control section (weighted average)
Clay content: 18 to 25 percent
Silt plus very fine sandy content: 25 to 40 percent
Rock fragments: rounded quartzite or ironstone pebbles range from none to few
CEC/clay ratio: 0.40 to 0.60
Base Saturation: 35 to 60 percent in the lower part of the argillic horizon
A or Ap horizon
Hue: 7.5YR or 10YR
Value: 3 or 4, horizons with value of 3 and chroma of 2 or 3 are less than 18 cm (7 in) thick
Chroma: 2 to 4
Texture: fine sandy loam, very fine sandy loam, loam or loamy very fine sand
Reaction: very strongly acid to slightly acid (4.5 to 6.5)
E horizon
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 2 to 4
The combined thickness of A and E horizons: 22 to 42 cm (5 to 17 in)
Texture: fine sandy loam, very fine sandy loam, loam or loamy fine sand
Reaction: very strongly acid to slightly acid (4.5 to 6.5)
E/B or BE horizon where present
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 6 or 8
The combined thickness of A and E horizons: 15 to 51 cm (6 to 20 in)
Texture: fine sandy loam, very fine sandy loam or loam
Reaction: strongly acid to slightly acid (5.1 to 6.5)
Bt horizon
Hue: 7.5YR or 10YR
Value: 4 to 7
Chroma: 3 to 8
Redox concentrations: amount-none to many, size-medium, contrast-distinct to prominent, boundary-clear, shades-red and brown
Redox depletions: amount-none to many, size-medium, contrast-distinct ot prominent, boundary-clear, shades-gray, depletions with chroma 2 or less are below a depth of 30 inches
Texture: loam, sandy clay loam or clay loam Plinthite: none to 4 percent nodular plinthite Reaction: very strongly acid to slightly acid (4.5 to 6.5)
Bt/E horizon
Bt part
Hue: 5YR to 10YR
Value: 4 to 7
Chroma: 3 to 8
Redox concentrations: amount-few to many, size-medium, contrast-distinct to prominent, boundary-clear, shades-brown and red.
Redox depletions: amount-few to many, size-medium, contrast-distinct or prominent, boundary-clear, shades-gray
Texture: fine sandy loam, loam or sandy clay loam.
E part
Albic material: 5 to 25 percent in vertical streaks, pockets or coatings on the surface of peds
Plinthite: none to 4 percent nodular plinthite
Reaction: very strongly acid to slightly acid (4.5 to 6.5)
BCt/E horizon where present
BCt part
Hue: 5YR to 10YR
Value: 4 to 7
Chroma: 3 to 8
Redox concentrations: amount-few to many, size-medium, contrast-distinct to prominent, boundary-clear, shades-brown and red.
Redox depletions: amount-few to many, size-medium, contrast-distinct ot prominent, boundary-clear, shades-gray
Texture: fine sandy loam, loam, sandy clay loam, or clay loam
E part
Albic material: 5 to more than 15 percent in vertical streaks, pockets or coatings on the surface of peds
Plinthite: none to 4 percent nodular plinthite
Reaction: very strongly acid to slightly acid (4.5 to 6.5)
B't or BCt horizon where present
Color: shades of brown, red, yellow and gray
Texture : fine sandy loam, loam, sandy clay loam or clay loam
Albic material: 0 to 10 percent by volume
Reaction: very strongly acid to slightly acid (4.5 to 6.5)
COMPETING SERIES: These are the
Bernaldo,
Bernow,
Gallime, and
Latex soils in the same family, and the similar
Attoyac,
Besner,
Bowie,
Freestone, and
Sawtown series in closely related families. Bernaldo soils are formed in alluvial deposits on terraces.
Bernow soils: do not have an apparent water table within depths of 122 to 183 cm (4 to 6 ft).
Gallime soils have an epipedon 50 to 100 cm (20 to 40 in) thick.
Latex soils: are clayey in the lower part of the Bt horizon.
Attoyac soils: have colors with hue redder than 5YR in the upper part of the Bt horizon.
Besner soils: have coarse-loamy particle size control sections.
Bowie soils: have base saturation less than 35 percent.
Freestone soils: become clayey with depth and have redox depletions within 75 cm (30 in) of the surface.
Sawtown soils: have a clayey 2Bt horizon.
GEOGRAPHIC SETTING:
Parent material: Sandy and clayey deposits of the Wilcox geology
Landscape: Coastal Plain
Landform: Interfluve
Slope: Slope gradients are mainly 1 to 5 percent, but range to 8 percent.
Mean annual air temperature range: 18 to 20 degrees C (64 to 68 degrees F)
Mean annual precipitation range: 1016 to 1219 mm (40 to 48 in)
Frost-free period: 240 to 260 days
Elevation: 61 to 183 m (200 to 600 ft)
Thornthwaite annual P-E indices: more than 64 to 84
GEOGRAPHICALLY ASSOCIATED SOILS: These are the closely related
Keithville,
Latex,
Metcalf, and
Scottsville series, and the
Eastwood,
Frierson,
Hallsummit, and
Timpson series. Keithville, Latex, Metcalf, and Scottsville soils are on similar landscapes. The Keithville and Metcalf soils have fine-silty sediments over a clayey discontinuity and the Latex and Scottsville soils have fine-loamy sediments over a clayey discontinuity. Eastwood and Hallsummit soils have red clayey Bt horizons. Eastwood soils are found on gently sloping ridges and moderately steep side slopes along drainage ways. Hallsummit soils are found on slightly higher convex ridge tops. Frierson soils are found on slightly convex ridge tops and have red loamy Bt horizons. Timpson soils are found on slightly lower mounded landscapes.
DRAINAGE AND PERMEABILITY: Keatchie soils are well drained. They have moderate permeability. Runoff on 1 to 3 percent is very low, 3 to 5 percent is low, and 5 to 8 percent is medium. The soil is wet in the layers below a depth of 122 to 183 cm (4 to 6 ft) during the winter and spring seasons in normal years.
USE AND VEGETATION: Principal use is woodland with dominant species of pine such as loblolly and shortleaf and many oak species and other southern hardwoods. Some areas are in pasture. Pastures are mainly in improved or common bermudagrass, bahiagrass, overseeded with legumes of crison and arrowleaf clovers, vetch or singletary peas. Small areas are farmed to hay, and truck crops.
DISTRIBUTION AND EXTENT: Mainly in the Southern Coastal Plain of eastern Texas and Oklahoma. The series is of moderate extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: TEMPLE, TEXAS
SERIES ESTABLISHED:
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface of the soil to depth of approximately 40 cm (16 in) (A and E horizons)
Argillic horizon - the zone from approximately 40 to 203 cm (16 to 80 in) (Bt, Bt/E horizons)
Glossic horizon - the zone from approximately 152 to 203 cm (60 to 80 in) (Bt/E horizon)
Intrusions of albic material - 5 to 15 percent albic materials in the form of streaks, pockets and coating on the surface of peds. (Bt/E horizon, 122 to 203 cm [48 to 80 in].)
This soil was formally mapped Bernaldo.
National Cooperative Soil Survey
U.S.A.